By Qingfeng Li, David Aili, Hans Aage Hjuler, Jens Oluf Jensen
This publication is a accomplished evaluation of high-temperature polymer electrolyte membrane gasoline cells (PEMFCs). PEMFCs are the popular gasoline cells for various functions similar to vehicles, cogeneration of warmth and gear devices, emergency energy and conveyable electronics. the 1st five chapters of the booklet describe clarification and representation of methods to extreme temperature PEM platforms. Chapters 6 - thirteen are dedicated to fabrication, optimization and characterization of phosphoric acid-doped polybenzimidazole membranes, the first actual electrolyte process that has confirmed the idea that of and inspired broad learn task within the box. The final eleven chapters summarize the state of the art of technological improvement of excessive temperature-PEMFCs in accordance with acid doped PBI membranes together with catalysts, electrodes, MEAs, bipolar plates, modelling, stacking, diagnostics and applications.
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Extra info for High Temperature Polymer Electrolyte Membrane Fuel Cells: Approaches, Status, and Perspectives
Example text
A further increase in cell temperature produced a decrease in cell performance and an unstable behavior for the bare membrane, due to strong dehydration under these conditions. The composite membrane presents better water retention at temperatures above 100 C [3]. When the fuel cell temperature is raised, there is also an enhancement of the methanol electro-oxidation kinetics. The fuel cross-over decreases the OCV due to the presence of a mixed potential at the cathode, whereas the improved electro-kinetics is generally associated with higher power densities.
The other way is to use less volatile proton carriers in the membrane. Different approaches to better water retention at high temperature have been explored. Alternative PFSA membranes with shorter side chains and higher crystallinity and particularly their composites with inorganic fillers have shown some feasibility, often in association with a slightly higher pressure, as described in Chap. 2. , CsHSO4 and CsH2PO4) have been extensively explored. Fuel cell electrolytes made of such solid inorganic proton conductors as the main constituent are however rather ceramic than polymer electrolytes and not included in this book.
There is evidence that such an effect is mainly due to the water retention capability of the filler [6]. 8 7 frequently used as desiccant materials in storage systems. In this application, after some time, saturation by the environment humidity occurs. The desiccant materials are “re-activated” by desorbing the condensed water at temperatures around 120–150 C [6]. This fact indicates that such materials may physically adsorb and retain water on the surface at temperatures close to those ideal for PEMFC/DMFC operation in automotive applications [2].